Re: My kingdom! My kingdom! My kingdom for an HEI module that will last
Does the "new engine harness" still have an "R" terminal connection at the starter solenoid? There is the possibility of a high voltage spike from Back-EMF when the power is removed from the "S" terminal when the engine fires.
What plug gap are you using?
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'67 GMC 2500, 292, 4spd, AC
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